Kill an established Trumpet Vine?


Trumpet vine is established in the middle of our flowerbed. It is under the lawncloth and mulch, intertwining with the other plans and spreading in all directions. For four years, I have partially dug every start, pulled up spreading roots and cut back, cut back, cut back. Unsuccessfully. Is there a way to kill a specific invasive plant without harming the surrounding plantings?

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